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When handling the battery, avoid squeezing or touching the four exposed lithium polymer cells.

Lift the battery from its edge nearest the logic board and remove it from the upper case.

If you're installing a new battery, you should calibrate it after installation:

Charge it to 100%, and then keep charging it for at least 2 more hours. Then, unplug and use it normally to drain the battery. When you see the low battery warning, save your work, and keep your laptop on until it goes to sleep due to low battery. Wait at least 5 hours, then charge your laptop uninterrupted to 100%.

If you notice any unusual behavior or problems after installing your new battery, you may need to reset your MacBook's SMC.

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This often happens due to a swollen battery. It bumps up against the bottom of the trackpad, preventing it from clicking down. It tends to get worse over time. If removing the battery allows your trackpad to click normally, or if the battery is visibly swollen, replace your battery right away.

When I reinstall my trackpad, there is too much "play" or too much room for clicking. It seems like the set screw is screwed in farther than it was originally, and it still doesn't seem to be enough. Also, the mouse isn't working; it won't move, and the click doesn't cause any action. What did I do wrong?